build(tools/clean-cache): fix upath import (#16245)

* fix(tools/clean-cache): fix upath import

* fix(tools/clean-cache): fix upath import

tools/clean-cache.mjs

 import { tmpdir } from 'os';
 import { remove } from 'fs-extra';
-import { join } from 'upath';
+import upath from 'upath';
 
 // eslint-disable-next-line @typescript-eslint/no-floating-promises
 (async () => {
   const tmpDir = process.env.RENOVATE_TMPDIR ?? tmpdir();
-  const renovateDir = join(tmpDir, 'renovate');
+  const renovateDir = upath.join(tmpDir, 'renovate');
   // eslint-disable-next-line no-console
   console.log('Removing ' + renovateDir);
   await remove(renovateDir);